Treating anal fistula at home: 5 ways to help the wound heal quickly

Anal fistula often not only causes pain or discomfort but can also lead to recurrent swelling, discharge, or pus around the anus. According to the American Society of Colon and Rectal Surgeons (ASCRS), anal fistulas are often associated with a previous anal abscess and can form an abnormal tunnel connecting the anal canal to the skin. Up to 40% of people who have had an anal abscess may develop a fistula.

If you are looking for ways to treat anal fistula, it is important not to focus solely on temporary pain relief or drying the wound. Anal fistula often requires a doctor to evaluate the fistula tract, its involvement with the sphincter muscle, and underlying causes to choose the appropriate treatment method. In many cases, surgery is the main treatment; however, the management approach may vary depending on the type of fistula and the specific condition.

In this article, Tiptory will help you understand what an anal fistula is, common symptoms, how to treat anal fistula, lifestyle changes that can support recovery, and when a person with an anal fistula needs to see a doctor. The goal is to help you correctly identify the problem and avoid prolonging the condition with temporary solutions.

Part 1: Home care for anal fistula for quick pain relief

Method 1: Proper nutrition to support anal fistula healing

Prioritize a balanced diet

• Build a diverse diet with whole grains, green vegetables, fruits, and lean proteins to support digestive health and soften stools.

• For those looking to treat anal fistula, proper nutrition does not replace medical treatment but can help limit constipation and reduce irritation in the anal area.

• It is not necessary to completely avoid a food group if your body does not react to it.

Increase fiber to limit constipation

• Supplement fiber from vegetables, fruits, beans, and whole grains. Fiber helps increase stool bulk and promotes easier bowel movements.

• Constipation and straining during bowel movements can irritate the anal area, causing discomfort in people with anal fistula.

• Increase fiber gradually and drink enough water for your body to adapt, avoiding too rapid an increase which can cause bloating or abdominal distension.

Monitor foods that cause discomfort

• Each person has different food tolerances. Pay attention to foods that cause bloating, diarrhea, or digestive upset and adjust accordingly.

• Spicy foods, high-fat foods, or processed foods are not necessarily direct causes of anal fistula, but if they cause digestive upset or abnormal bowel movements, they should be limited.

Limit high-fat foods

• A diet too high in fat can change bowel habits and affect digestive health.

• However, it should not be understood that dietary fat will directly "block the fistula tract." Anal fistula is often related to infection and anal gland abscess, so diet only plays a supportive role.

• If pain increases, swelling, redness, pus discharge, or fever occur, do not just adjust your diet but seek medical attention for evaluation and treatment of the cause.

Understand the true role of nutrition

• Healthy eating can help maintain regular bowel movements and limit constipation, but no diet can cure an anal fistula on its own.

• Once a fistula has formed, many cases require evaluation and treatment by a proctologist, and surgery may be indicated depending on the location and complexity of the fistula.

• Therefore, if the goal is an effective way to treat anal fistula, consider nutrition as a supportive part alongside medical diagnosis and treatment.

Method 2: Drink enough water to limit constipation

Drink enough water every day

• Aim for about 1.5 liters of water per day unless your doctor advises you to restrict fluids. Actual needs may vary depending on weight, activity level, weather, and health status.

• Drinking enough water helps fiber work more effectively, contributing to softer stools and easier bowel movements. This is especially helpful if you have anal fistula with constipation.

Prioritize plain water over sugary drinks

• Plain water should be your primary source of fluids throughout the day. You can supplement fluids from water-rich foods and an appropriate amount of fruit juice.

• Do not overuse sugary soft drinks as they are not optimal for maintaining a diet that supports digestive health.

• If alcohol causes dehydration, digestive upset, or worsens symptoms, it should be limited or avoided.

Combine water with fiber

• Fiber and water should go together: increasing fiber but drinking too little water can make stools harder to pass for some people.

• Increase your fiber intake gradually while maintaining a regular habit of drinking water throughout the day to support easy bowel movements and reduce constipation.

• No need to try to drink a lot of water in a short time. Regular, consistent drinking is more practical and easier to maintain.

Do not consider drinking water as a cure for anal fistula

• Drinking enough water can help control constipation and reduce straining during bowel movements, but cannot cure an anal fistula on its own.

• If anal fistula causes pain, swelling, pus discharge, recurrent abscesses, or fever, it needs to be evaluated by a specialist. Treatment depends on the location, structure of the fistula tract, and its involvement with the anal sphincter.

• Especially, people with digestive diseases or conditions requiring fluid restriction should ask their doctor about appropriate water intake instead of increasing it themselves.

Method 3: Reduce pressure when sitting for long periods

Use a seat cushion when sitting for extended periods

• If your job requires you to sit for long periods, use a soft seat cushion or a pressure-relieving cushion to increase comfort and limit pressure on the anal area.

• For people with anal fistula, a proper sitting posture can help reduce discomfort, especially when the area around the anus is painful or sensitive.

• It is not necessary to use a "donut-shaped" cushion. This type of cushion can create inappropriate pressure on some areas; prioritize cushions that distribute pressure well and make you feel comfortable.

Change positions frequently

• Avoid sitting continuously for many hours. Every so often, stand up, walk around gently, or change your position.

• If your job requires prolonged sitting, you can alternate between standing and walking to reduce continuous pressure on the buttocks and anus.

• The goal is not to find a posture that "cures" anal fistula, but to reduce factors that can make the injured area more uncomfortable.

Keep the anal area clean and dry

• After bowel movements, clean gently with clean water and pat dry, avoiding vigorous rubbing of the area with the fistula opening or discharge.

• Wear breathable clothing and keep the anal area dry to limit skin irritation.

• If there is significant discharge or pus, use clean absorbent materials as directed by medical staff.

See a doctor if symptoms worsen

• Seat cushions and changing positions are only measures to help reduce discomfort, not a way to cure anal fistula.

• If increasing pain, hot redness, significant pus discharge, fever, or a painful mass around the anus appears, seek medical attention early as these could be signs of an abscess or progressing infection.

• Once an anal fistula has formed, treatment needs to be based on a doctor's evaluation, as many cases cannot resolve on their own with just posture changes or home care.

Method 4: Use absorbent pads for anal fistula discharge

Use absorbent pads when there is fistula discharge

• If anal fistula causes discharge or pus leakage, soft absorbent pads can be used to keep the skin around the anus dry and limit fluid from soaking into clothing.

• Choose a type with a soft surface, appropriate size, and good absorbency. For heavy discharge, a doctor or nurse can recommend a more suitable wound care material.

• Absorbent pads only help control exudate and reduce inconvenience in daily life; they do not close the fistula tract and do not replace methods to treat anal fistula.

Change pads frequently

• Do not leave damp or soiled pads on for too long, as discharge can irritate the skin, increasing itching and discomfort.

• Change immediately when the pad is very wet or soiled with feces; at the same time, gently clean and dry the surrounding skin.

• If the discharge has a distinct foul odor, the amount of discharge increases abnormally, or additional pain, swelling, and fever appear, seek medical attention instead of just increasing the frequency of pad changes.

Prioritize comfort and hygiene

• Thin pads are often convenient when going to work or traveling. In cases of heavy discharge, larger absorbent products may be needed as professionally advised.

• Do not stuff paper, cotton, or inappropriate materials into the fistula opening to try to stop the discharge, as this can cause irritation or tissue damage.

• After cleaning, keep the anal area clean and dry, and wear breathable underwear to limit skin irritation.

Remember that pads do not treat the disease

• Anal fistula is often associated with an abnormal fistula tract and can be accompanied by infection or abscess. Absorbent pads only address the "external discharge," not the underlying cause.

• If the fistula condition is prolonged, recurrent, or frequently discharges pus, the patient should be examined by a proctologist to identify the fistula tract and choose an appropriate anal fistula treatment method.

Method 5: Maintain hygiene to reduce irritation

Gentle cleaning after bowel movements

• After each bowel movement, clean the anal area with clean water or a gentle cleaning method to remove residual feces and discharge.

• For people with anal fistula, keeping the skin around the anus clean can help limit irritation from prolonged contact with feces or fistula discharge.

• Avoid vigorous rubbing, using harsh soaps, or fragranced products if they cause dry, burning, or irritated skin.

Be proactive when needing to use the restroom outside the home

• If rinsing with water is not possible, use alcohol-free, fragrance-free wet wipes for temporary cleaning, then clean more thoroughly when conditions permit.

• Do not wipe too many times or rub vigorously, as the irritated skin around the anus may become more sensitive.

• Wash hands thoroughly with soap and water after using the restroom or after caring for the fistula area to limit the spread of bacteria.

Change underwear when there is fistula discharge

• If anal fistula causes discharge, change underwear when it is damp or soiled instead of wearing it for a long time.

• Appropriate absorbent pads can be used to limit direct contact between discharge and skin or clothing.

• Wash underwear and towels separately or clean them properly; do not share personal towels with others.

Keep the anal area dry and airy

• After cleaning, gently pat dry with a clean towel or soft material. No need to rub to dry.

• Wear breathable, well-fitting underwear to reduce friction and moisture around the anus.

• If the skin around the fistula opening is frequently red, itchy, burning, or painful, discuss it with your doctor for appropriate care instructions.

Hygiene does not replace treatment

• Good personal hygiene helps reduce irritation and limit the risk of local infection, but it cannot make the fistula tract close on its own.

• Therefore, if you are looking for ways to treat anal fistula, you should not rely solely on home hygiene. Anal fistula may require specialized treatment depending on its location, depth, and involvement with the sphincter muscle.

• If there is increased pain, hot redness, significant pus discharge, fever, or a painful mass around the anus, seek medical attention early to rule out an abscess or progressing infection.

Method 6: Pain relief for anal fistula

Assess the cause of pain first

• Pain from anal fistula can be dull, sharp, or significantly increase when sitting for long periods. However, rapidly increasing or constant pain should not be managed only with painkillers.

• When the fistula tract is blocked, infected fluid may not drain and can accumulate, forming an anal abscess, causing swelling, pain, and possibly fever.

• If pain becomes increasingly severe, a painful swelling appears around the anus, accompanied by fever or chills, seek medical attention early instead of self-treating at home.

Discuss pain medication with your doctor

• Some over-the-counter pain relievers, such as paracetamol or ibuprofen, may be used in appropriate cases.

• Ibuprofen belongs to the non-steroidal anti-inflammatory drug (NSAID) group, but not everyone can use it. People with a history of ulcers or gastrointestinal bleeding, kidney disease, those taking anticoagulants, or with certain other medical conditions should consult a doctor before use.

• Do not arbitrarily increase dosage, combine multiple pain relievers, or use them long-term without guidance from medical professionals.

Care for the skin around the anus

• Pus or discharge from anal fistula can irritate the skin, causing the area around the anus to become red, burning, or itchy.

• Gentle cleaning after bowel movements, patting dry, and changing pads when damp or soiled can help reduce prolonged contact between the skin and discharge.

• Avoid vigorous rubbing or using fragranced products if the skin is irritated.

Do not consider pain relievers as a cure for anal fistula

• Pain relievers primarily help control symptoms, they do not make the fistula tract disappear and do not treat the infection if present.

Method 7: Boost health to support recovery

Eat a nutritious diet to support immunity

• Maintain a varied diet with fish, olive oil, green vegetables, citrus fruits, whole grains, and healthy protein sources to provide essential vitamins, minerals, and fats.

• Omega-3s found in certain fish and seafood may support heart health and regulate inflammatory responses. However, there is no evidence that a specific food can cure anal fistula.

• Prioritize natural foods over relying on supplements. If your diet is lacking or you have special nutritional needs, consult your doctor before taking supplements.

Maintain appropriate physical activity

• Regular physical activity helps maintain overall health and supports bowel movements, which can help prevent constipation.

• If you have an anal fistula, choose an activity level that suits your pain and avoid activities that cause friction or increased discomfort in the anal area.

• If you have recently undergone a procedure or surgery, follow your doctor's instructions regarding when and how much to exercise.

Get enough sleep and drink enough water

• Adequate sleep helps the body maintain immune functions and tissue repair processes.

• Drinking enough water combined with a high-fiber diet helps soften stools and facilitates easy bowel movements, especially useful if anal fistula disease is accompanied by constipation.

• There's no need to force yourself to drink too much water; the appropriate amount depends on your physical condition, weather, activity level, and co-existing medical conditions.

Quit smoking and limit unhealthy habits

• If you smoke, quitting is a beneficial change for overall health and the body's recovery ability.

• Limit alcohol, excessive consumption of ultra-processed foods, and maintain proper hygiene of the anal area.

• These changes help create favorable conditions for health, but cannot replace specialist treatment for anal fistula.

Don't confuse immune support with fistula treatment

• Eating healthy, exercising, getting enough sleep, and good hygiene can support overall health, but there is no evidence that "boosting immunity" can make a fistula close on its own.

• The treatment for anal fistula depends on its cause, location, and complexity. Many cases require procedures or surgery to address the fistula.

• If the fistula recurs, there is prolonged pus discharge, increased pain, swelling, or fever, it is advisable to seek specialist examination instead of relying solely on supplements or lifestyle changes.

Method 8: Light exercise to aid recovery

Maintain light activity if your body allows

• Slow walking or gentle activities can help maintain overall health and reduce a sedentary lifestyle.

• For those with an anal fistula, choose activities that do not cause pain, friction, or significant pressure on the anal area.

• You don't need to exercise vigorously to gain benefits. A few short walks throughout the day may be more practical if you are experiencing discomfort.

Stop exercising if pain or discomfort occurs

• If pain increases, you feel dizzy, unusually tired, or unable to continue, stop and rest.

• Do not try to "speed up" the healing of an anal fistula, as over-exertion cannot make the fistula close on its own.

• After surgery or a procedure to treat anal fistula disease, the timing for resuming exercise should follow your doctor's instructions.

Combine exercise with stress management

• Chronic stress can affect sleep, eating habits, and overall health. Maintaining appropriate physical activity can support mood and mental well-being.

• You can try light activities like walking, stretching, or yoga if these activities do not cause anal pain.

• View exercise as part of overall health care, rather than a direct treatment for anal fistula.

Choose exercises appropriate for your condition

• If you are unsure what level of activity is appropriate, ask your doctor about safe exercises based on the fistula's location, pain level, and ongoing treatment.

• During periods of abscess, infection, or severe pain, prioritize rest and treating the cause rather than attempting exercise.

• When symptoms stabilize, you can gradually increase duration and intensity according to your body's tolerance.

Remember that exercise only plays a supportive role

• Walking, yoga, and light activities can help maintain health, but they are not a cure for anal fistula.

• If you experience persistent pain, pus discharge, swelling around the anus, or recurrent symptoms, you need to be evaluated by a specialist to determine the cause and choose the appropriate treatment.

• The important thing is to create a beneficial cycle: appropriate exercise → better digestion → more stable daily life → better conditions for the body to recover, rather than forcing the body to overexert itself.

Part 2: Anal fistula treatment and surgery

Method 1: Examination and diagnosis of anal fistula

Seek medical attention when suspicious signs appear

• If the area around your anus is frequently painful, swollen, or experiences recurrent discharge of pus or fluid in the same spot, you should see a doctor instead of just self-treating at home.

• The doctor will inquire about your symptoms, history of anal abscesses, gastrointestinal diseases, and related issues, then examine the anal-rectal area.

• Most cases of anal fistula can be identified based on medical history and clinical examination.

Direct examination to find the fistula tract

• The doctor may observe the external fistula opening, swelling, redness, and discharge of pus or blood.

• A digital rectal exam or anoscopy may be performed when necessary to locate the internal fistula opening and assess related damage.

• Not all cases show a clear external fistula, especially when the opening is temporarily closed or the fistula is deep.

MRI when tract identification is needed

• Pelvic MRI can help the doctor map the fistula tract, identify the internal opening, secondary branches, and potential abscesses.

• MRI is particularly useful when complex anal fistula, recurrent fistula, or Crohn's disease affecting the anal area is suspected.

• According to ASCRS guidelines, MRI, ultrasound, CT, or fistulography may be considered in cases of closed abscesses, complex fistulas, or perianal Crohn's disease.

Ultrasound or CT in appropriate cases

• Endoanal ultrasound can help identify the fistula tract and detect deep abscesses. In some cases, contrast enhancement techniques may be combined to clarify the fistula.

• CT scan can be helpful when complex infections, multiple fistula tracts, or other co-existing conditions are suspected.

• For simple anal fistulas, patients typically do not need all imaging tests; the doctor will choose the method based on symptoms and examination results.

Additional tests when other diseases are suspected

• If the doctor suspects Crohn's disease, inflammatory bowel disease, or another cause of the fistula, additional endoscopy and appropriate imaging tests may be ordered.

• It should not be understood that everyone with a fistula needs a colonoscopy or CT, MRI. Further examination depends on symptoms, medical history, and complexity.

• The goal of diagnosis is to determine where the fistula tract is located, whether there are secondary branches or abscesses, and its involvement with the sphincter muscle, thereby choosing the appropriate anal fistula treatment method and minimizing the risk of affecting fecal continence function.

Do not self-diagnose or self-treat a fistula

• Anal fistula disease can present similarly to other issues like abscesses, anal fissures, or other anal-rectal conditions. Therefore, accurate identification of the fistula tract should be performed by medical professionals.

• If there is severe pain, hot swelling, fever, chills, or a painful mass around the anus, seek medical attention promptly as these could be signs of an abscess requiring urgent treatment.

• Correct diagnosis is a crucial step before choosing an anal fistula treatment method; treatment should not be based solely on pain level or amount of discharge.

Method 2: Surgery is the main treatment

Surgery is often the main treatment method

• Once an anal fistula has formed, diet changes, hygiene, or pain relievers usually cannot make the fistula close on its own. Treatment needs to be based on the structure and complexity of the fistula tract.

• Fistulotomy is one of the common methods, in which the doctor opens the fistula tract to allow the lesion to heal from the inside out.

• According to ASCRS guidelines, fistulotomy may be chosen for cases of simple anal fistula when the risk of sphincter involvement is low.

Method selection based on anal sphincter

• Not all cases are suitable for fistulotomy. If the fistula tract passes through a significant portion of the sphincter muscle, cutting the entire tract can increase the risk of affecting fecal continence.

• For complex anal fistulas, the doctor may prioritize sphincter-preserving methods such as seton placement for drainage, flap techniques, or other procedures.

• Therefore, the goal of anal fistula treatment is not only to eliminate the fistula but also to protect sphincter function in the long term.

Seton placement for continuous drainage

• A seton is a thread or soft material placed through the fistula tract to maintain drainage, help control infection, and drain the fistula cavity.

• Setons can be used in cases of complex fistulas or those extensively involving the sphincter muscle. The duration of seton placement depends on the treatment goal and the doctor's plan.

• Cutting seton is not suitable for everyone and is currently used cautiously due to the risk of affecting fecal continence function.

Flap techniques may be needed

• For some complex anal fistula diseases, the doctor may choose mucosal flap or endorectal flap techniques to close the internal fistula opening while minimizing sphincter cutting.

• This method requires careful pre-operative evaluation and is typically considered when fistulotomy carries a risk of sphincter damage.

• The choice of technique depends on the location of the fistula opening, the number of branches, the infection status, and previous treatments.

Do not self-select surgical methods

• Each fistula tract has a different structure. The doctor may need to examine and explore during surgery or use MRI/ultrasound in complex cases to plan treatment.

• Do not rely on a fixed success rate to decide on surgery, as results depend on the type of anal fistula, the technique used, and the individual's sphincter condition.

• If you are looking for an anal fistula treatment method, discuss treatment goals, recurrence risk, and the risk of affecting continence with a colorectal specialist before deciding on a method.

Method 3: Esophageal fistula requires emergency treatment

Recognizing esophagotracheal fistula

• Not all anal fistulas are like fistulas in other organs. A fistula between the esophagus and trachea or bronchus is a serious condition that can cause food, water, or secretions to enter the airway.

• Patients may experience coughing or choking when eating or drinking, shortness of breath, recurrent pneumonia, fever, or respiratory infections.

• This condition requires early medical evaluation and treatment; home remedies for anal fistula or self-medication should not be used.

Treatment aims to close the fistula and protect the airway

• The doctor will choose the method based on the location, size of the fistula, cause, and condition of the esophagus and airway.

• Some cases may require esophageal dilation to improve narrowing or help maintain esophageal patency.

• Self-expanding metallic stents may be used in some cases to maintain esophageal lumen and help cover the fistula.

• Plastic-covered stents may also be considered to seal the fistula between the esophagus and trachea. Some types have a valve design to limit reflux depending on the placement site.

Do not self-treat at home

• Procedures such as esophageal dilation or stent placement must be performed in a medical facility by a qualified doctor.

• Esophagotracheal fistula can lead to aspiration pneumonia, lung abscess, and severe infection if not managed.

• If the patient is continuously coughing or choking when eating or drinking, experiencing shortness of breath, or showing signs of recurrent pneumonia, they need to be evaluated at a medical facility immediately.

Distinguish from anal fistula

• Anal fistula and esophagotracheal fistula are two completely different conditions, so the same treatment method cannot be applied.

• If the article focuses on anal fistula disease, information about esophageal fistula should be presented as a note to prevent readers from misunderstanding that all types of fistulas require the same surgical method.

• For anal fistula, the treatment method must be chosen based on the course of the fistula and its involvement with the anal sphincter muscle.

Method 4: Follow-up appointments after treatment

Attend scheduled follow-up appointments after surgery

• After anal fistula treatment, follow-up appointments help the doctor check the wound, the healing of the fistula tract, and detect early signs of infection or recurrence.

• Do not stop follow-up appointments simply because pain or discharge has decreased. The fistula may not be fully healed even if the outside appears stable.

• Follow instructions for wound care, hygiene, and post-surgical activity to support the recovery process.

Pay special attention if you have inflammatory bowel disease

• If anal fistula disease is related to Crohn's disease or another inflammatory bowel disease, treatment of the fistula needs to go hand-in-hand with controlling the underlying disease.

• Crohn's disease can increase the risk of perianal fistulas and recurrence. Therefore, the doctor may combine surgical and medical treatment depending on the condition.

• Patients should inform their doctor if they experience new pain, swelling, discharge, or new digestive symptoms after treatment.

Monitor for signs of infection

• Pay attention to symptoms such as fever, increased pain, hot swelling and redness around the anus, increased pus, unusual fatigue, or a worsening overall condition.

• These signs may suggest infection or abscess and require early medical evaluation.

• Do not try to squeeze out pus or unblock the fistula at home as this can damage tissue and complicate the infection.

Skin care and managing discharge

• If there is still discharge after treatment, keep the perianal area clean and dry, changing the pad when it becomes damp or soiled.

• Clean gently after bowel movements and avoid harsh rubbing on the healing area.

• If the amount of discharge increases again, an unusual odor appears, or the old fistula swells and becomes painful, contact a doctor for examination.

Do not ignore the cause of the fistula

• Effective anal fistula treatment not only involves addressing the fistula tract but also identifying and controlling the underlying cause, if any.

• For people with Crohn's or inflammatory bowel disease, controlling inflammation plays a crucial role in the treatment plan and reduces the risk of recurrence.

• For other types of fistulas such as esophageal-tracheal fistulas or fistulas between the intestine and other organs, monitoring will be completely different and requires a specialist doctor. Therefore, the guidelines for anal fistulas should not be applied to these types of fistulas.

Method 5: Do not self-administer antibiotics for fistulas

Only use antibiotics when prescribed by a doctor

• Anal fistulas do not always require antibiotics. Antibiotics are mainly considered when there is a concomitant infection, such as cellulitis, systemic infection, or certain special cases.

• Determining whether there is an infection requires symptoms, examination, and in some cases, laboratory tests. You should not rely solely on white blood cell counts to decide to take medication yourself.

• Antibiotics do not make the fistula disappear. Therefore, prolonged use of medication or self-medication is not an effective anal fistula treatment.

Do not self-administer antibiotic dosages found online

• You should not self-administer metronidazole, ciprofloxacin, vancomycin, or a combination of multiple antibiotics at a fixed dose.

• The choice of drug, dosage, and duration of treatment depends on the location of the infection, severity, underlying diseases, history of medication use, and risk of antibiotic resistance.

• In particular, vancomycin has specific indications and routes of administration; you should not self-change medication or dosage based on guidelines for another type of fistula disease.

Differentiate between infection and normal fistula condition

• An anal fistula may discharge fluid or pus, which does not necessarily mean the patient always needs antibiotics.

• If fever, chills, rapidly increasing pain, swelling, redness, severe fatigue, or a painful lump around the anus appear, you should see a doctor early to evaluate for abscess or infection.

• When an abscess is present, drainage of the pus is often an important factor in treatment; antibiotics do not always replace drainage.

Treating the underlying cause is the focus

• For anal fistulas, the treatment goal is to control infection if present, treat the fistula tract, and protect sphincter function.

• The doctor may choose appropriate surgery or procedure depending on the type of fistula; antibiotics only play a supportive role in cases with indications.

• If anal fistula disease is related to Crohn's disease or another underlying condition, the cause must be controlled simultaneously to reduce the risk of recurrence.

Use medication correctly to avoid antibiotic resistance

• If antibiotics are prescribed, take the correct medication, dose, and for the full duration as prescribed.

• Do not stop medication as soon as you feel better, do not reuse old prescriptions, and do not share antibiotics with others.

• If a rash, shortness of breath, severe diarrhea, or other unusual reactions occur after taking the medication, contact a medical facility for guidance.

Part 3: Causes and symptoms of anal fistulas

Note 1: Causes and contributing factors of fistulas

Anal fistulas are often associated with abscesses

• An anal fistula typically forms after a perianal abscess becomes infected and creates an abnormal tunnel connecting the anal canal to the skin.

• Once the abscess has drained, this tunnel may persist and continue to discharge fluid, leading to chronic or recurrent anal fistula disease.

• Therefore, a history of perianal abscess is an important factor when a doctor evaluates the cause.

Crohn's disease can increase the risk of fistulas

• Crohn's disease is a chronic inflammatory bowel disease that can cause inflammation and deep tissue damage in the intestinal wall, including the anal-rectal region.

• In people with Crohn's disease, anal fistulas can be more complex and have a higher risk of recurrence compared to simple fistulas.

• If Crohn's disease is present, controlling the underlying inflammation is an important part of the anal fistula treatment plan.

Other causes need to be evaluated

• In addition to abscesses and Crohn's disease, fistulas can be related to other conditions such as infections, inflammatory bowel disease, trauma, or surgery in the anal-rectal area.

• Some rarer conditions, such as tuberculosis or cancer, can also be associated with fistula formation in different parts of the body.

• Due to the diverse causes, it should not be assumed that all cases of anal fistula disease stem from the same cause.

Fistulas in other locations have different causes

• Rectovaginal fistulas may be related to Crohn's disease, obstetric trauma, radiation therapy, or cancer.

• Some fistulas between organs can appear after surgery or trauma.

• Therefore, information about the cause should be understood according to the location of the fistula, and the causes of anal fistulas should not be applied to all types of fistulas.

Congenital fistulas in children need separate evaluation

• Some fistulas in infants and young children can appear due to congenital abnormalities.

• This is a different group of diseases from acquired anal fistulas in adults, and therefore needs to be evaluated by a pediatrician or pediatric surgeon.

• Parents should not self-apply home remedies for anal fistulas to children without accurately identifying the type of fistula.

Identifying the cause helps determine the treatment method

• Knowing the cause helps the doctor decide whether to treat the underlying disease, control infection, or intervene directly in the fistula tract.

• If a fistula appears multiple times, has prolonged discharge, or has abnormal digestive symptoms, the doctor may need to perform further tests to find underlying medical conditions.

• For anal fistulas, the goal is not only to reduce discharge or pain but also to treat the fistula tract and related causes to limit recurrence.

Note 2: Recognizing signs of anal fistula

Monitor discharge

• A common sign of an anal fistula is an abnormal small opening around the anus that secretes discharge, which may be pus or fluid with an unpleasant odor.

• Discharge can be intermittent or persistent. Some people notice a reduction in discharge after an abscess drains spontaneously but then it reappears.

• Persistent discharge around the anus should not be considered a normal hygiene issue, especially if the condition recurs in the same location.

Pay attention to pain and swelling around the anus

• Pain may occur when the fistula becomes inflamed or an abscess forms. The pain can sometimes increase when sitting or during bowel movements.

• If pain rapidly increases accompanied by swelling, warmth, redness, or a painful mass around the anus, you should see a doctor early to check for a possible abscess.

• When an abscess becomes blocked and cannot drain well, symptoms can become more pronounced.

Bleeding may occur

• A small amount of blood may appear when the injured area is irritated, but anal bleeding is not a specific sign of an anal fistula.

• If there is significant bleeding, recurrent bleeding, or blood in the stool, it needs to be evaluated by a doctor to rule out other causes.

Recognize associated digestive symptoms

• Abdominal pain, diarrhea, nausea, vomiting, loss of appetite, or weight loss are not always caused by anal fistula disease.

• When these symptoms are persistent, especially if accompanied by chronic diarrhea or unintentional weight loss, the doctor may need to look for underlying conditions such as inflammatory bowel disease.

• Identifying the cause is very important because some diseases, such as Crohn's, can be associated with perianal fistulas.

Know when to seek early medical attention

• Seek medical care if you experience severe pain, fever, chills, swelling and redness around the anus, profuse pus, or significant worsening of general condition.

• These signs may be related to an abscess or infection that needs treatment, rather than relying solely on personal hygiene or pain relievers.

• If the fistula has persistent discharge or recurs multiple times, a proctologist should be consulted to identify the fistula tract.

Do not rely on symptoms to self-diagnose

• Symptoms such as pain, bleeding, or discharge can occur in various anal-rectal conditions.

• Therefore, recognizing the signs is only the first step; an accurate diagnosis helps select the appropriate anal fistula treatment.

• If an anal fistula is suspected, experts recommend not attempting to squeeze, poke, or try to close the fistula yourself, as these methods can complicate the infection.

Note 3: Common types of anal fistulas

Understand the structure of the fistula tract

• An anal fistula is an abnormal tunnel connecting the anal canal or rectum to the external skin.

• The fistula can have one or more openings, a simple or branched path. This structure directly affects the choice of anal fistula treatment.

• Not all fistulas have the same shape or complexity, so doctors need to assess each case specifically before treatment.

Incomplete fistula

• Some fistulas have only one opening to the skin or an incompletely formed connection between two locations.

• These cases can be difficult to recognize if the external opening is small or temporarily not discharging fluid.

• Do not attempt to squeeze or poke the fistula to check, as this can cause injury and infection.

Complete fistula

• A complete fistula has both an internal opening and an external opening, forming a connection between the anal canal or rectum and the skin.

Horseshoe fistula

• A horseshoe fistula is a complex type, where the fistula tract can wrap around the anus and form branches on both sides.

• This type can have multiple infection foci or fistula branches, so treatment is often more difficult than for a simple fistula.

• Some cases require imaging diagnostics such as MRI to fully assess the fistula structure before treatment.

Don't rely solely on appearance for self-assessment

• The classification of fistulas is not solely based on the number of openings. Doctors also consider the path of the fistula, its involvement with the sphincter muscle, the number of branches, and the presence of abscesses.

• This is why a seemingly small external fistula can have a complex internal structure.

• If the fistula frequently discharges pus, recurs with swelling and pain, or has a history of perianal abscess, a specialist should be consulted for accurate assessment.

The type of fistula determines the treatment approach

• Simple anal fistulas may be suitable for fistulotomy in cases where the risk of sphincter involvement is low.

• For complex anal fistulas, the doctor may consider sphincter-preserving methods such as seton placement, flap advancement, or other techniques depending on the fistula structure.

• Therefore, there is no single anal fistula treatment suitable for all patients; accurate diagnosis of the fistula type is the foundation for safe treatment and limiting recurrence.

Note 4: Possible complications of anal fistula

Inflammation and irritation of the perianal skin

• Pus or discharge from an anal fistula constantly contacting the skin can cause redness, burning, itching, and inflammation around the fistula opening.

• Gentle cleaning after bowel movements, patting dry, and changing pads when damp can help reduce irritation.

• Do not rub vigorously or use perfumed products if the skin is damaged.

Recurrent abscesses and infections

• One of the notable problems with anal fistula disease is that the fistula tract can become blocked, causing infected fluid to accumulate and form an abscess.

• Warning signs include rapidly increasing pain, swelling, warmth, redness, a painful mass around the anus, fever, or chills.

• If an abscess is suspected, seek medical attention early. Do not try to squeeze or drain pus at home.

Fistulas can recur

• Even after treatment, anal fistulas can recur in some people, especially when the fistula is complex, has multiple branches, or is associated with Crohn's disease.

• Therefore, scheduled follow-up visits and monitoring for signs such as recurrent discharge, swelling, or pain at the old site are very important.

• Treating the underlying cause, if any, also helps limit the risk of recurrence.

Need to differentiate from other serious medical conditions

• Some other conditions in the anal-rectal area can cause bleeding, pain, abnormal lumps, or discharge similar to an anal fistula.

• Anal-rectal cancer is not a common complication of anal fistulas, but persistent abnormal symptoms should be evaluated by a doctor to rule out other causes.

• Rare infections or injuries should also not be self-diagnosed based solely on external manifestations.

Maintain proper hygiene

• After bowel movements, clean the anal area gently with water or an appropriate hygiene method, then pat dry.

• When not able to wash with water, a gentle wet wipe can be used for temporary cleaning and then discarded after a single use.

• Wash hands with soap after using the toilet and after caring for the fistula area to limit the spread of bacteria.

Know when to seek immediate medical attention

• If anal fistula disease is accompanied by fever, chills, severe pain, rapid swelling, profuse pus, or a noticeable feeling of weakness, seek medical attention promptly.

• These symptoms may be related to an abscess or infection that needs treatment, and should not be managed solely with personal hygiene or pain medication.

• Good hygiene helps control symptoms, but is not a cure for anal fistula. Once a fistula has formed, it needs to be evaluated by a doctor to determine the appropriate treatment plan.

References

1. Gaertner, W. B., Burgess, P. L., Davids, J. S., Lightner, A. L., Shogan, B. D., Sun, M. Y., Steele, S. R., Paquette, I. M., & Feingold, D. L. (2022). Management of anorectal abscess, fistula-in-ano, and rectovaginal fistula. Diseases of the Colon & Rectum, 65(8), 964–985.
2. Feuerstein, J. D., Ho, E. Y., Shmidt, E., Singh, H., Falck-Ytter, Y., Sultan, S., & Terdiman, J. P. (2021). AGA clinical practice guidelines on the medical management of moderate to severe luminal and perianal fistulizing Crohn’s disease. Gastroenterology, 160(7), 2496–2508.
3. Steinhart, A. H., Panaccione, R., Targownik, L., Bressler, B., Khanna, R., Marshall, J. K., Feagan, B. G., & Canadian Association of Gastroenterology. (2019). Clinical practice guideline for the medical management of perianal fistulizing Crohn’s disease: The Toronto Consensus. Journal of the Canadian Association of Gastroenterology, 2(3), 141–154.
4. National Institute of Diabetes and Digestive and Kidney Diseases. (2019). Colonic and anorectal fistulas. National Institutes of Health.
5. National Health Service. (2023). Anal fistula: Overview. NHS.
6. National Health Service. (2023). Anal fistula: Treatment. NHS.
7. American Gastroenterological Association. (2025). Best practices for Crohn’s perianal fistula. American Gastroenterological Association.
8. American Gastroenterological Association. (2021). Medical management of moderate to severe luminal and perianal fistulizing Crohn’s disease. American Gastroenterological Association.
9. Steinhart, A. H., Panaccione, R., Targownik, L. E., Bressler, B., Khanna, R., Marshall, J. K., Feagan, B. G., & Canadian Association of Gastroenterology. (2018). Clinical practice guideline for the medical management of perianal fistulizing Crohn’s disease: The Toronto Consensus. Journal of the Canadian Association of Gastroenterology.
10. Guy’s and St Thomas’ NHS Foundation Trust. (2026). Anal fistula treatment. Guy’s and St Thomas’ NHS Foundation Trust.

Content editor: Leigh Kennedy Ly.

Information reviewed and verified by expert: Isabella Moore.